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          WireGuard 源 IP 地址"漂移"问题的前因后果
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    <div class="post-body" itemprop="articleBody"><p>在现代网络架构中，VPN（虚拟专用网络）技术的应用越来越广泛。本文将探讨在我司 IDC 中，使用 WireGuard 实现的 VPN 连接中遇到的一个有趣现象。</p>
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<h2 id="场景描述"><a href="#场景描述" class="headerlink" title="场景描述"></a>场景描述</h2><p>我司在 IDC 中有一台运行 Debian 的服务器 L1，有两个上联口：E-a 和 E-b，分别连接到运营商 I-a 和 I-b。IP 地址为 ip-a 和 ip-b。L1 上的策略路由很简单：</p>
<ul>
<li>源地址为 ip-a 的数据包通过 E-a 口走 I-a</li>
<li>其他数据包则通过默认出口 E-b 走 I-b（源地址自然是 ip-b）</li>
</ul>
<p>此外，L1 还通过网口 E-c 连接内网，IP 地址为 ip-c。L1 上运行 WirGuard，绑定 0.0.0.0 的 udp 端口 12345。</p>
<p>在办公室，我司还有一台运行 Debian 的机器 L2。由于 L2 位于内网中，没有公网 IP。L2 上也运行着 WireGuard，绑定在 0.0.0.0 的（udp）端口 12345。同时，我在办公室的路由器上做了端口映射，将 udp 12345 端口映射到 L2（虽然这完全没什么用）。</p>
<p>L2 的 WireGuard 配置中，peer 的 endpoint 指定为 L1 的 IP 地址 ip-a。由于 L2 没有公网地址且出口地址不固定，因此在 L1 的 WireGuard 配置中并没有指定 L2 的 IP 地址。就这样，L1 和 L2 上的 WireGuard 的连接顺利建立，一切都如预期般正常运行。</p>
<h2 id="异常现象"><a href="#异常现象" class="headerlink" title="异常现象"></a>异常现象</h2><p>其实，L2 上还运行着一个 SmokePing，监测着 ip-a、ip-b 和 ip-c，当然也还有其他，不过那些跟这里没啥关系，也就不提了。</p>
<p>某天我在 Smokeping 监控中发现，ping ip-c 的（时间）值明显高于 ping ip-a 的值，且与 ping ip-b 的相近。这一现象让我感到困惑，因为到 ip-c 的数据包走的逻辑链路（通过 WireGuard 隧道）实际上应该与到 ip-a 的物理链路完全相同，所以 ping ip-c 的数据应该跟 ping ip-a 的几乎一样才对。</p>
<p>我的第一反应是，可能是办公室的网络接入商或 I-a 对 UDP 包进行了 QoS 限速，因为 WireGuard 使用的是 UDP 协议。经过与客服的沟通，确认并没有针对 UDP 包的限速策略。</p>
<p>接着，我使用 <code>iperf3</code> 在 L1 和 L2 之间进行了测速，发现走 UDP 和走 TCP 的测试结果数据引并没有显著差别，这表明问题并不在于 UDP 包有被干扰。随后，我在 L2 上使用 <code>tcpdump</code> 监听 WireGuard 的数据包，结果让我大吃一惊：所有的数据包都是与 ip-b 的端口 12345 进行交互，而不是预期中的 ip-a！这也解释了为什么 ping ip-c 的延迟与 ping ip-b 的延迟相近，因为数据实际上是通过到 ip-b 的物理链路进行的。</p>
<h2 id="深入分析"><a href="#深入分析" class="headerlink" title="深入分析"></a>深入分析</h2><p>面对这一现象，我感到百思不得其解。于是，我记录下当前的状况，并重启了 L2 上的 WireGuard，结果一切又都恢复正常：WireGuard 的数据交互对端 IP 变回了 ip-a，ping ip-c 的延迟也降到了与 ping ip-a 相同的水平。</p>
<p>进一步查阅资料后，我发现 WireGuard 具有 endpoint 自动更新的机制。虽然 L1 上没有 L2 端的 endpoint 数据，但 L2 上有 L1 的数据。当 L2 第一次连接 L1 时，L1 会记录下 L2 的 endpoint 数据。如果 L2 使用了不同的 IP 地址连接 L1，L1 会更新 L2 的 endpoint IP 地址。反之亦然。这意味着，当 L1 从 E-b 口以 ip-b 作为源地址连接 L2 时，L2 也会更新 L1 的 endpoint IP 地址。</p>
<p>最终，我意识到问题的根源在于 L1 突然使用源 IP 为 ip-b 从 E-b 口发送 WireGuard 数据包给 L2。期间，我发现办公网的网络曾经闪断过几分钟。真相逐渐浮出水面：当 L2 的上联公网链路断开时，L1 由于长时间未收到来自 L2 的 WireGuard 数据包，可能出于某种原因主动向 L2 发送 WireGuard 包，查找 L2 的 endpoint IP 和端口数据。此时，由于源地址未定，数据包直接通过 E-b 口发送，源地址被设为 ip-b。这些数据包持续发送到 L2，直到 L2 的上联网络恢复。L2 收到来自 ip-b 的 L1 的 WireGuard 数据包后，触发了更新 L1 的 endpoint 数据，从而开始与 L1 的 ip-b 进行 WireGuard 数据交互。</p>
<h2 id="结论"><a href="#结论" class="headerlink" title="结论"></a>结论</h2><p>通过这一系列的分析，整个逻辑变得自洽了。这一现象不仅揭示了 WireGuard 的灵活性和自动化特性，也提醒我们在设计网络架构时，需考虑到各种可能的网络状态变化。希望这篇文章能为您在使用 WireGuard 或其他 VPN 技术时提供一些启示。</p>

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